0:00:05 > 0:00:06Hi, guys.
0:00:06 > 0:00:08I'm Ayshah and you are live with Newsround with the kids
0:00:08 > 0:00:10meeting the Prime Minister coming up.
0:00:10 > 0:00:13Plus the spacecraft on a mission to discover how life on Earth began.
0:00:13 > 0:00:18And we want you to tell us where your pet goes on holiday.
0:00:21 > 0:00:24But first to the six young musicians who have just completed the
0:00:24 > 0:00:28performance of their lives. The stars of CBBC show The Big
0:00:28 > 0:00:32Performance have been working hard to come up with a song to sing at a
0:00:32 > 0:00:34special event in Belgium to mark 100 years since the start of World War
0:00:36 > 0:00:41I. Ricky went along to see how they got on.
0:00:52 > 0:00:54Guys, you're performing in about an hour's time.
0:00:54 > 0:00:55How are you feeling?
0:00:55 > 0:00:58I am extremely nervous, but I think I am more excited
0:00:58 > 0:01:00because it is such a big occasion.
0:01:00 > 0:01:02I am just got to try and channel all the nerves into
0:01:02 > 0:01:04energy so that I am really excited.
0:01:04 > 0:01:07It is fabulous, it is really good to be here, finally, because you
0:01:07 > 0:01:10understand what the song needs to be like when it is performed.
0:01:10 > 0:01:13It has to be relaxed, it has to be beautiful and thoughtful.
0:01:13 > 0:01:14Because these are war graves.
0:01:14 > 0:01:16It is not a pop song.
0:01:16 > 0:01:18Before we go and perform, somebody very important would
0:01:18 > 0:01:19like to meet us.
0:01:19 > 0:01:20Prime Minister David Cameron.
0:01:20 > 0:01:20No!
0:01:20 > 0:01:22No way.
0:01:22 > 0:01:23Where are you from?
0:01:23 > 0:01:25My name is Sam and I am from Exeter.
0:01:25 > 0:01:28To know that people like David Cameron are rooting for us and
0:01:28 > 0:01:30they want us to succeed is amazing.
0:01:30 > 0:01:32David Cameron was asking us stuff like where we were from, who
0:01:32 > 0:01:34wrote the song, stuff like that.
0:01:34 > 0:01:36I think we were all really nervous answering him.
0:01:36 > 0:01:39So the kids from the Big Performance have now met the Prime Minister,
0:01:39 > 0:01:40they have done the rehearsal.
0:01:40 > 0:01:43In less than an hour they will be singing right here.
0:01:43 > 0:01:45I bet they are feeling very, very nervous.
0:01:45 > 0:01:49I am just doing this to keep the nerves away.
0:01:49 > 0:01:55I am just really nervous.
0:01:55 > 0:02:02I cannot believe my songs is going to be heard by millions of people.
0:02:02 > 0:02:03Enjoy it.
0:02:03 > 0:02:05Shall we go?
0:02:05 > 0:02:07Yes.
0:02:07 > 0:02:08# Stand up.
0:02:08 > 0:02:09# Be proud.
0:02:09 > 0:02:11# They are all our heroes.
0:02:11 > 0:02:15# Fight for peace.
0:02:15 > 0:02:22# We walk ahead as one.
0:02:27 > 0:02:31And The Big Performance is on every day this week and you can see that
0:02:31 > 0:02:34episode from Belgium on Friday. And there is loads more about World War
0:02:34 > 0:02:39I on the Newsround website too.
0:02:39 > 0:02:42In other news, China says a rare gas on the moon could help power earth
0:02:42 > 0:02:45for the next 10,000 years. The Chinese became the first country in
0:02:45 > 0:02:5040 years to land a spacecraft on the moon's surface last year. And now
0:02:50 > 0:02:54the scientists behind the project say mining for a special lunar gas
0:02:54 > 0:02:58called Helium 3 could help provide a new kind of energy. Scientists here
0:02:58 > 0:03:06say it could be possible.
0:03:06 > 0:03:09And sticking with space, a probe that has been chasing
0:03:09 > 0:03:12a comet across the solar system for ten years will finally reach
0:03:12 > 0:03:13its orbit this morning.
0:03:13 > 0:03:15The Rosetta spacecraft could become the first man-made object
0:03:15 > 0:03:19in history to travel around an icy, 10,000-mile an hour comet.
0:03:19 > 0:03:21And scientists hope it could help unlock some of the mysteries
0:03:21 > 0:03:25of life.
0:03:25 > 0:03:27Very soon the Rosetta spacecraft will begin to orbit this comet
0:03:27 > 0:03:31and then spend the next few months analysing what it is made from.
0:03:31 > 0:03:33Its mission is to find out whether comets kickstarted life
0:03:33 > 0:03:36on planet Earth.
0:03:36 > 0:03:42Comets scattered across the early Earth 4.5 billion years ago bringing
0:03:42 > 0:03:45with them water and possibly some of the ingredients for life.
0:03:45 > 0:03:48Scientists believe those ingredients mixed to create the chemicals
0:03:48 > 0:03:53from which life may have emerged.
0:03:53 > 0:03:56The biggest question that we are trying to get an answer to is
0:03:56 > 0:04:02where did life on Earth come from?
0:04:02 > 0:04:04Did it start, how did life get going?
0:04:04 > 0:04:07Was it the building blocks of life that were brought to us from comets?
0:04:07 > 0:04:10Rosetta will spend the next few months taking measurements
0:04:10 > 0:04:11and pictures of the comet.
0:04:11 > 0:04:13It is up close and personal.
0:04:13 > 0:04:15We will be able to understand everything that there is to
0:04:15 > 0:04:17understand about the comet, about the chemical composition,
0:04:17 > 0:04:21about whether the ice on the comet was indeed the source
0:04:21 > 0:04:23of the oceans on planet Earth.
0:04:23 > 0:04:27In November, scientists plan to land a probe to see what it is made
0:04:27 > 0:04:36of and find out whether comets hold the key to how life began on Earth.
0:04:36 > 0:04:42And finally, you are on your summer break from school, you might be off
0:04:42 > 0:04:44Earlier this week we told you that research suggested more
0:04:44 > 0:04:48of us are taking our pooches, cats and other animals away with us.
0:04:48 > 0:04:51So we want you to get in touch and tell us if your pet's going
0:04:51 > 0:04:52on holiday and where to.
0:04:52 > 0:04:55Head to the Newsround website to find out how to get involved.
0:04:55 > 0:04:58That's all from me, Newsround's back right here this afternoon at
0:04:58 > 0:05:014:20.